The Durona Group was a mostly-female group of 36 clones who were created by Lilly Durona from her own DNA. Lilly Durona had originally been created by Ry Ryoval's father as his very special "slave doctor." When he died and Ry Ryoval took over the management of the House, Lilly decided to flee together with a younger half-brother of Ry's named Georish Stauber. They fled to House Fell; Lilly began cloning herself again and again, producing the Durona Group. The group served as family doctors for upper management Fell employees and as researchers in military poisons and antidotes.